@TheMayoMachine posted:Agreed...A1 Sidewinder or something similar is the way to go. I’ve been told that what I affectionately call a “hotdog muffler” is rather self-defeating in that the exhaust gasses push against each other when they enter on opposing sides of the muffler before they exit the tailpipe(s).
Some sort of a 4 into 1 system like the A1 eliminates the opposing pressure and allows the engine to breathe well. The sound is a little deeper but really nice.
It's a little more complicated than that. A well designed exhaust uses the pulses of one cylinder to draw the spent gases out of another cylinder. Similar to an expansion chamber on a two stroke. But note "well designed exhaust" in italics. I'd take a WAG that 80% of exhausts on the market are just random pipes welded together to fit the space with little or no research into whether they work properly or not.